Study and optimized design of stator core structure in single-sided linear induction motor

Single-sided linear induction motor (SLIM) has many advantages, such as simple structure, easy maintenance, less environmental pollution and direct drive without the translation of mechanisms etc. However, longitudinal end effect deteriorates the performance because of the discontinuous magnetic circuit in SLIM. In this paper, the 2-D transient electromagnetic field of SLIM is computed using finite element method (FEM) and a novel stator core structure by parametric analysis is proposed. The longitudinal end effect, the distribution and variation of eddy current and electromagnetic force with respective to frequency is analyzed in detail as well as flux density in air gap. Furthermore, the result has been compared with other structures in common use before. The conclusion indicates that the novel structure is helpful to could raise the utilization rate of stator core without the compensation winding and decrease the core loss of stator. These will be of positive significance to increase efficiency of linear induction motors.